Brass American NH Fire Fittings Hose CouplingsAmerican NH fire fittings are commonly known as NH fire fittings but may also be referred to as NPT, NPSH and ANST fire fittings. Match-Light exports a comprehensive range of American gunmetal fire fittings covering fire hose couplings, male and female adaptors, blank caps/plugs and washers, all available in a variety of sizes and configurations to meet every application.